Gas-valve.



UNITED STATES FFTCEQ CHARLES E. FORSYTH, OF AKRON, OHIO, ASSIGNOR OFTlVO-THIRDS TO MARK GAIR AND PHILP F. HAAS, OF SAMEPLAOE.

GAS-VALV E.

SPECIFICATION forming part of Letters Patent No. 674,606, dated May 21,1901.

Application filed February 25, 1901- $erial No. 48,812. (No model.)

To aZZ whom, it may concern.-

Be it known that I, CHARLES E. FoRsYTH, a citizen of the UnitedStates,residing at Akron, in the county of Summit and State of Ohio,have invented a certain new and useful Improvement in Gas-Valves, ofwhich the following is a specification.

My invention has relation to improvements in that class of valvesadapted to be used in connection with inflammable gas for lighting orheating purposes, to close the admission of gas upon the absence orgreat decrease of the gas-pressure sufficient to extinguish the lightedburners, and to prevent the reentrance of gas upon an increase or returnof such pressure.

The object of my invention is to produce a new and improved valve thatwill be simple in construction, effective in operation,readilyinterposed in the service-pipe, occupying a small space, and witha minimum of working parts.

To the accomplishment of the foregoing object my invention consists inthe peculiar and novel construction, arrangement, and combination ofparts hereinafter described and then specifically pointed out in theclaims,reference being had to the accompanying drawing, which forms apart of this specification.

In the accompanying drawing, which represents a vertical central sectionof my device, l is a hollow cylinder closed at the bottom and open atthe top, having near the bottom oppositely disposed internallyscrewthreaded horizontal sockets 2 3, into which are screwed adjacentends of the servicepipes 4 5. Within the cylinder 1 is a cupshaped valve6, with the open end upward and beveled near the top from within to apractically sharp edge and having on the bottom a lug 7. This valve isadapted to slide vertically in the cylinder and is made What may becalled a free working fit,sufficiently loose to permit a slight escapeof gas around it. The top of the cylinder is externally screw-threadedand is closed with a screwcap 8, between which and the cylinder 1 is apacking-ring 9, which extends sufiiciently toward the center to beencountered by the sharp upper edge of the valve 6. Integral with thecap 8 is a vertical hollow post internally connected through the cap bya smaller opening, in which freely slides a valve-stem 10, having on itslower end a valve 11 to bear against the under face of the cap 8 and atits upper end a push-button 12, constantly -pressed upward by a coiledspring 13, ar-

ranged to bear against an annular shoulder at the bottom of the hollowpost, and thus normally prevent the escape of air from the case 1.

In operation the valve 6 Will primarily rest at its lowest positionuntil gas under pressure isintroduced into one of the pipes 4 5. As themachine is adapted to Work in either direction, either pipe may be usedas the induction and the opposite as the eduction pipe. Assuming thatthe pipe 4 is the induction and gas under pressure is introduced intoit, the first effect will be to push the valve 6 in the oppositedirection the slight almost infinitesimal distance to press against theopposite wall of the cylinder 1, and thusclose the opening to the socket3 and effectually close it against the passage of gas. To open thisvalve, the button 12 is pressed, thus opening the valve 11 andpermitting the air above the valve 6 to escape, when the gas-pressure,acting under the valve 6, will raise it to the position indicated by thedotted lines and open communication between the sockets 2 3 and permitthe gas to pass. As soon as the valve 11 is closed air cannot enterabove the valve 6, and hence a partial vacuum will be formed to preventits descent, which, coupled with the gas-pressure beneath it, willcontinue it suspended until there is a decided decrease or absolute lackof the gas-pressure,when the weight of the valve 6 Will overcome thepartial vacuum and allow the valve 6 to slowly settle to the bottom ofthe cylinder, and thus again close the communication between the sockets2 and 3.

Having thus described my invention and the nature of its operation, whatI claim, and desire to protect by Letters Patent, is

1. An improved gas cut-0d of the kind designated consisting of acylindrical cup-shaped cell with a detachable cap andoppositely-disposed openings adjacent to the bottom thereof adapted tobe connected with adjacent ends of the service and house pipes, and acup-shaped valve, less in height than said cell, adapted to freely slidetherein and permit a slight escape of gas around it with its open endupward, substantially as shown and described.

2. An improved gas cut-off, embodying a closed cylinder having openingsnear the bottom, to be connected with inlet and outlet pipesrespectively, and a cup-shaped valve adapted to slide verticallytherein, adapted to permit a slight escape of gas around it and havingmeans for arresting its descent slightly above the bottom of thecylinder, substantially as shown and described.

3. An improved gas-check consisting of a cylinder closed at the bottom,with inlet and outlet pipes,connected near the bottom therewith, andhaving a detachable cover, and a cup-shaped valve arranged to fit andslide in said cylinder with the open end upward sufficiently free topermit a slight escape of gas around it, and means substantially asdescribed for permitting the escape of air through said cover,substantially as described.

4. An improved gas-check consisting of cylinder closed at the bottom,with inlet and outlet pipes near its bottom, a cover provided with anoutlet-valve to permit the air to es cape at will, a cup-shaped valvefitted with the open end upward to slide in said cylinder sufficientlyfree to permit a slight escape of gas around it adjusted to rise by thegaspressure upon the opening of said outletvalve, to permit gas to passfrom the inlet to the outlet pipe, and to fall upon a decrease of saidgas-pressure, substantially as shown and described.

5. An improved gas-check embodying a cylinder closed at the bottom withinlet and outlet pipes adjacent thereto, a cup-shaped valve adapted tofit and slide in said cylinder to open and close said pipes sufficientlyloose to permit a slight escape of gas around it, a cover to close saidcylinder, and a valve opening from the interior of said cylinder topermit the escape of air therefrom, substantially as shown anddescribed.

In testimony that I claim the above I hereunto set my hand in thepresence of two subscribing witnesses.

GHARLES E. FORSYTH.

In presence of 0. E. HUMPHREY, C. P. HUMPHREY.

